JP6310530B2 - Engine pistons - Google Patents
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- JP6310530B2 JP6310530B2 JP2016221170A JP2016221170A JP6310530B2 JP 6310530 B2 JP6310530 B2 JP 6310530B2 JP 2016221170 A JP2016221170 A JP 2016221170A JP 2016221170 A JP2016221170 A JP 2016221170A JP 6310530 B2 JP6310530 B2 JP 6310530B2
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Description
本発明は、エンジンのピストンに関し、詳しくは、凹部へのエンジンオイルの供給を改善することができるエンジンのピストンに関する。 The present invention relates to an engine piston, and more particularly to an engine piston capable of improving the supply of engine oil to a recess.
従来、図４に示すように、エンジンのピストンとして、スカート部(１０１)の表面に樹脂皮膜(１０２)と凹部(１０３)とを備えたものがある(例えば、特許文献１参照)。 Conventionally, as shown in FIG. 4, there is an engine piston provided with a resin film (102) and a recess (103) on the surface of a skirt (101) (see, for example, Patent Document 1).
この種のピストンによれば、樹脂皮膜(１０２)でスカート部(１０１)のプロフィールが最適化され、ピストンスラップ音が低減されるとともに、凹部(１０３)に溜まったエンジンオイルでスカート部(１０１)の摩擦が低減される利点がある。 According to this type of piston, the profile of the skirt portion (101) is optimized by the resin film (102), the piston slap noise is reduced, and the skirt portion (101) is generated by the engine oil accumulated in the recess (103). There is an advantage that the friction is reduced.
しかし、この従来技術では、図４に示すように、一連の樹脂皮膜(１０２)にスポット状に複数の凹部(１０３)が配置されているため、問題がある。 However, this conventional technique has a problem because a plurality of recesses (103) are arranged in a spot shape on a series of resin films (102) as shown in FIG.
《問題点》 エンジンオイルによるスカート部の摩擦低減機能が不十分であった。
図４に示すように、一連の樹脂皮膜(１０２)にスポット状に複数の凹部(１０３)が配置されているため、凹部(１０３)が樹脂皮膜(１０２)に囲まれ、凹部(１０３)へのエンジンオイルの供給が困難である。このため、凹部(１０３)に十分な量のエンジンオイルが保持されず、エンジンオイルによるスカート部(１０１)の摩擦低減機能が不十分であった。
<Problem> The friction reducing function of the skirt portion by engine oil was insufficient.
As shown in FIG. 4, since a plurality of recesses (103) are arranged in a spot shape on a series of resin films (102), the recesses (103) are surrounded by the resin film (102) and go to the recesses (103). It is difficult to supply engine oil. For this reason, a sufficient amount of engine oil is not retained in the recess (103), and the friction reducing function of the skirt (101) by the engine oil is insufficient.
本発明の発明者らは、研究の結果、図１(Ａ)〜(Ｅ)に例示するように、スカート部(１)の表面にスポット状に複数の樹脂皮膜(２)を配置し、樹脂皮膜(２)(２)同士の間に形成される凹部(３)で網目状溝(４)を形成すれば、網目状溝(４)すなわち凹部(３)へのエンジンオイルの供給が改善され、凹部(３)に十分な量のエンジンオイルが保持され、エンジンオイルによるスカート部(１)の摩擦低減機能が高まることを発見し、この発明に至った。 As a result of research, the inventors of the present invention arranged a plurality of resin films (2) in a spot shape on the surface of the skirt portion (1) as illustrated in FIGS. If the mesh groove (4) is formed by the recess (3) formed between the films (2) and (2), the supply of engine oil to the mesh groove (4), that is, the recess (3) is improved. The inventors have found that a sufficient amount of engine oil is retained in the recess (3), and that the friction reducing function of the skirt (1) by the engine oil is enhanced, leading to the present invention.
本発明の課題は、凹部へのエンジンオイルの供給を改善することができる、エンジンのピストンを提供することにある。 The subject of this invention is providing the piston of an engine which can improve supply of the engine oil to a recessed part.
(請求項１に係る発明)
請求項１に係る発明の発明特定事項は、次の通りである。
図１(Ａ)〜(Ｅ)に例示するように、スカート部(１)の表面に樹脂皮膜(２)と凹部(３)とを備えたエンジンのピストンにおいて、
図１(Ａ)〜(Ｅ)に例示するように、スカート部(１)の表面にスポット状に複数の樹脂皮膜(２)が配置され、樹脂皮膜(２)(２)同士の間に形成される凹部(３)で網目状溝(４)が形成され、
図１(Ｃ)(Ｅ)に例示するように、スカート部(１)の周方向に複数の樹脂皮膜(２)が所定間隔を置いて配置された樹脂皮膜列(５)を備え、この樹脂皮膜列(５)がピストン昇降方向(６)に複数列配置され、
図１(Ａ)に例示するように、ピストン昇降方向(６)に複数列配置された樹脂被膜列(５)の被膜列群(５ａ)(５ｂ)は、爆発圧力でピストン(１２)がシリンダ(１４)側に押し付けられるスラスト側(１２ａ)と、スラスト側(１２ａ)と反対側の反スラスト側(１２ｂ)にそれぞれ設けられ、
図１(Ｃ)(Ｅ)に例示するように、各被膜列群(５ａ)(５ｂ)では、同じ樹脂皮膜列(５)の隣合う樹脂皮膜(２)(２)同士の間に形成される溝部分(７)のピストン昇降側両端開口部(７ａ)(７ｂ)が、ピストン昇降方向(６)で隣合う隣の樹脂皮膜列(５)の樹脂皮膜(２)に向けられ、
図１(Ａ)に例示するように、各被膜列群(５ａ)(５ｂ)では、樹脂皮膜(２)は相互反対側の一対の角部(２ａ)(２ｂ)をピストン昇降方向に向けた正六角形状に形成され、網目状溝(４)は正六角形状の網目で、ピストン昇側端の樹脂被膜列(５)の溝部分(７)は樹脂被膜(２)の無いピストン昇方向に向けて多数拡開され、ピストン降側端の樹脂被膜列(５)の溝部分(７)は樹脂被膜(２)の無いピストン降側に向けて多数拡開され、
図１(Ｃ)に例示するように、各皮膜列群(５ａ)(５ｂ)にそれぞれ設けられる各網目状溝(４)は、各樹脂被膜列(５)内に、隣り合う樹脂皮膜(２)(２)間のピストン昇降方向に沿う直線状溝部分(７ｃ)を多数備え、多数の直線状溝部分(７ｃ)のピストン昇降側両端開口部(７ａ)(７ｂ)が、ピストン昇降方向(６)で隣合う隣の樹脂皮膜列(５)の多数の樹脂皮膜(２)に向けられている、ことを特徴とするエンジンのピストン。
(Invention of Claim 1)
Invention specific matters of the invention according to
As illustrated in FIGS. 1A to 1E, in a piston of an engine provided with a resin film (2) and a recess (3) on the surface of a skirt (1),
As illustrated in FIGS. 1A to 1E, a plurality of resin films (2) are arranged in a spot shape on the surface of the skirt portion (1) and formed between the resin films (2) and (2). A mesh groove (4) is formed by the recessed portion (3) to be formed,
As illustrated in FIGS. 1C and 1E, a resin film array (5) in which a plurality of resin films (2) are arranged at predetermined intervals in the circumferential direction of the skirt (1) is provided. A plurality of film rows (5) are arranged in the piston lifting / lowering direction (6),
As illustrated in FIG. 1A, the coating row groups (5a) and (5b) of the resin coating row (5) arranged in a plurality of rows in the piston ascending / descending direction (6) have an explosion pressure and the piston (12) is a cylinder. (14) provided on the thrust side (12a) pressed against the side and on the opposite side (12b) opposite to the thrust side (12a),
As illustrated in FIGS. 1C and 1E, each film row group (5a) (5b) is formed between adjacent resin films (2) and (2) in the same resin film row (5). Opening ends (7a) and (7b) on both sides of the piston on the piston raising / lowering side of the groove portion (7) are directed to the resin film (2) of the adjacent resin film row (5) adjacent in the piston raising / lowering direction (6),
As illustrated in FIG. 1A, in each coating row group (5a) and (5b), the resin coating (2) has a pair of opposite corners (2a) and (2b) oriented in the piston ascending / descending direction. It is formed in a regular hexagonal shape , the mesh groove (4) is a regular hexagonal mesh, and the groove portion (7) of the resin film row (5) at the piston ascending end is in the piston ascending direction without the resin film (2). a large number widened toward the groove portion (7) of the piston descending end of the resin coating column (5) is a number widened toward the piston descending side without resin coating (2),
As illustrated in FIG. 1C, each mesh groove (4) provided in each film row group (5a) (5b) has an adjacent resin film (2) in each resin film row (5). ) (2) A large number of linear groove portions (7c) along the piston ascending / descending direction are provided, and the piston elevating side opening portions (7a) (7b) of the large number of linear groove portions (7c) 6) A piston for an engine, which is directed to a large number of resin films (2) in an adjacent resin film row (5) adjacent in 6).
(請求項１または２に係る発明)
請求項１または２に係る発明は、次の効果を奏する。
《効果》 凹部へのエンジンオイルの供給が改善される。
図１(Ａ)〜(Ｅ)に例示するように、スカート部(１)の表面にスポット状に複数の樹脂皮膜(２)が配置され、樹脂皮膜(２)(２)同士の間に形成される凹部(３)で網目状溝(４)が形成されているので、ピストン(１２)の昇降時に網目状溝(４)のピストン昇降側両端開口部(４ａ)(４ｂ)から網目状溝(４)内すなわち凹部(３)内にエンジンオイルが供給され、凹部(３)へのエンジンオイルの供給が改善される。このため、凹部(３)に十分な量のエンジンオイルが保持され、エンジンオイルによるスカート部(１)の摩擦低減機能が高まる。
(Invention according to
The invention according to
<Effect> Supply of engine oil to the recess is improved.
As illustrated in FIGS. 1A to 1E, a plurality of resin films (2) are arranged in a spot shape on the surface of the skirt portion (1) and formed between the resin films (2) and (2). Since the mesh groove (4) is formed by the recessed portion (3) to be formed, the mesh groove is formed from the openings (4a) and (4b) on both sides of the piston lifting and lowering side of the mesh groove (4) when the piston (12) is lifted and lowered. (4) The engine oil is supplied into the recess (3), and the supply of the engine oil to the recess (3) is improved. For this reason, a sufficient amount of engine oil is retained in the recess (3), and the function of reducing friction of the skirt (1) by the engine oil is enhanced.
《効果》 スカート部の広域に亘って、エンジンオイルの保持領域を形成することができる。
図１(Ａ)〜(Ｅ)に例示するように、スカート部(１)の表面にスポット状に複数の樹脂皮膜(２)が配置され、樹脂皮膜(２)(２)同士の間に形成される凹部(３)で網目状溝(４)が形成されているので、スカート部(１)の広域に亘って、エンジンオイルの保持領域を形成することができる。
<Effect> An engine oil holding region can be formed over a wide area of the skirt portion.
As illustrated in FIGS. 1A to 1E, a plurality of resin films (2) are arranged in a spot shape on the surface of the skirt portion (1) and formed between the resin films (2) and (2). Since the mesh groove (4) is formed by the recessed portion (3), an engine oil holding region can be formed over a wide area of the skirt portion (1).
《効果》 網目状溝のエンジンオイル保持機能を高めることができる。
図１(Ｃ)(Ｅ)に例示するように、同じ樹脂皮膜列(５)の隣合う樹脂皮膜(２)(２)同士の間に形成される溝部分(７)のピストン昇降側両端開口部(７ａ)(７ｂ)が、ピストン昇降方向(６)で隣合う隣の樹脂皮膜列(５)の樹脂皮膜(２)に向けられているので、ピストン(１２)の昇降によって溝部分(７)の両端開口部(７ａ)(７ｂ)から流出するエンジンオイルが隣の樹脂皮膜列(５)の樹脂皮膜(２)に衝突し、溝部分(７)からのエンジンオイルの流出が抑制され、網目状溝(４)のエンジンオイル保持機能を高めることができる。
(請求項３に係る発明)
請求項３に係る発明は、請求項１または２に係る発明の効果に加え、次の効果を奏する。
《効果》 スカート部でのエンジンオイル保持機能を高めることができる。
図１(Ｅ)に例示するように、樹脂皮膜(２)内に補助オイル溜め溝(１１)が凹設されているので、補助オイル溜め溝(１１)にもエンジンオイルが溜まり、スカート部(１)でのエンジンオイル保持機能を高めることができる。
<Effect> The engine oil retaining function of the mesh grooves can be enhanced.
As illustrated in FIGS. 1C and 1E, both ends of the piston lift side of the
(Invention of Claim 3 )
The invention according to
<Effect> The engine oil retention function in the skirt can be enhanced.
As illustrated in FIG. 1E, since the auxiliary oil reservoir groove (11) is recessed in the resin film (2), engine oil is accumulated in the auxiliary oil reservoir groove (11), and the skirt portion ( The engine oil retaining function in 1) can be enhanced.
図１は本発明の実施形態、図２は第１参考形態、図３は第２参考形態に係るエンジンのピストンを説明する図であり、実施形態と各参考形態では、立形ディーゼルエンジンのピストンについて説明する。 FIG. 1 is a diagram illustrating an embodiment of the present invention, FIG. 2 is a diagram illustrating a piston of an engine according to a first reference embodiment, and FIG. 3 is a diagram illustrating a piston of an engine according to the second reference embodiment. Will be described.
実施形態に係るエンジンのピストンについて説明する。
このピストン(１２)を取り付けるエンジンは、図１(Ａ)に示すように、シリンダ(１４)の上部にシリンダヘッド(１５)が組み付けられている。ピストン(１２)は、シリンダ(１４)に内嵌され、ピストン(１２)にコンロッド(１６)を介してクランク軸(１７)が連動連結されている。
シリンダヘッド(１５)には、吸気弁(１８)と排気弁(１９)と燃料インジェクタ(２０)が取り付けられている。
The piston of the engine according to the embodiment will be described.
As shown in FIG. 1 (A), the engine to which the piston (12) is attached has a cylinder head (15) assembled to the upper part of the cylinder (14). The piston (12) is fitted in the cylinder (14), and the crankshaft (17) is linked and connected to the piston (12) via a connecting rod (16).
An intake valve (18), an exhaust valve (19), and a fuel injector (20) are attached to the cylinder head (15).
図１(Ａ)〜(Ｅ)に示すように、スカート部(１)の表面に樹脂皮膜(２)と凹部(３)とを備えたエンジンのピストン(１２)において、図１(Ａ)〜(Ｅ)に示すように、スカート部(１)の表面にスポット状に複数の樹脂皮膜(２)が配置され、樹脂皮膜(２)(２)同士の間に形成される凹部(３)で網目状溝(４)が形成されている。 As shown in FIGS. 1A to 1E, in a piston (12) of an engine having a resin film (2) and a recess (3) on the surface of a skirt portion (1), FIG. As shown in (E), a plurality of resin films (2) are arranged in a spot shape on the surface of the skirt part (1), and the recesses (3) are formed between the resin films (2) and (2). A mesh-like groove (4) is formed.
図１(Ａ)(Ｂ)に示すように、樹脂皮膜(２)と凹部(３)とは、ピストン(１２)のスラスト側(１２ａ)と反スラスト側(１２ｂ)に形成されている。スラスト側(１２ａ)とは、爆発行程でピストン(１２)が下降する時に、爆発圧力でピストン(１２)がシリンダ(１４)に押し付けられる側をいい、反スラスト側(１２ｂ)はその反対側をいう。ピストン(１２)本体の素材には、鋳鉄またはアルミ合金等の金属が用いられている。樹脂皮膜(２)には、ポリアミド樹脂、エポキシ樹脂、フェノール樹脂、シリコーン樹脂、ポリイミド樹脂等の樹脂が用いられている。樹脂皮膜(２)には、遷移金属酸化物、グラファイト等の無機固体潤滑剤が含まれている。
樹脂皮膜(２)は、六角形に形成され、網目状溝(４)は六角網目状に形成されている。網目状溝(４)は、樹脂皮膜(２)(２)の間に形成され、内底面は、樹脂皮膜(２)で覆われていないスカート部(１)の金属表面で形成されている。
As shown in FIGS. 1A and 1B, the resin film (2) and the recess (3) are formed on the thrust side (12a) and the anti-thrust side (12b) of the piston (12). The thrust side (12a) is the side where the piston (12) is pressed against the cylinder (14) by the explosion pressure when the piston (12) descends during the explosion stroke, and the anti-thrust side (12b) is the opposite side. Say. A metal such as cast iron or aluminum alloy is used as a material of the main body of the piston (12). For the resin film (2), a resin such as a polyamide resin, an epoxy resin, a phenol resin, a silicone resin, or a polyimide resin is used. The resin film (2) contains an inorganic solid lubricant such as a transition metal oxide or graphite.
The resin film (2) is formed in a hexagonal shape, and the mesh grooves (4) are formed in a hexagonal mesh shape. The mesh-like groove (4) is formed between the resin films (2) and (2), and the inner bottom surface is formed by the metal surface of the skirt portion (1) not covered with the resin film (2).
図１(Ｃ)に示すように、スカート部(１)の周方向に複数の樹脂皮膜(２)が所定間隔を置いて配置された樹脂皮膜列(５)を備え、この樹脂皮膜列(５)がピストン昇降方向(６)に複数列配置されている。
スラスト側(１２ａ)と反スラスト側(１２ｂ)の各被膜列群(５ａ)(５ｂ)では、同じ樹脂皮膜列(５)の隣合う樹脂皮膜(２)(２)同士の間に形成される溝部分(７)のピストン昇降側両端開口部(７ａ)(７ｂ)が、ピストン昇降方向(６)で隣合う隣の樹脂皮膜列(５)の樹脂皮膜(２)に向けられている。各被膜列群(５ａ)(５ｂ)では、樹脂皮膜(２)は相互反対側の一対の角部(２ａ)(２ｂ)をピストン昇降方向に向けた正六角形状に形成され、網目状溝(４)は正六角形状の網目で、ピストン昇側端の樹脂被膜列(５)の溝部分(７)は樹脂被膜(２)の無いピストン昇方向に向けて多数拡開され、ピストン降側端の樹脂被膜列(５)の溝部分(７)は樹脂被膜(２)の無いピストン降側に向けて多数拡開されている。
図１(Ｃ)に示すように、各皮膜列群(５ａ)(５ｂ)にそれぞれ設けられる各網目状溝(４)は、各樹脂被膜列(５)内に、隣り合う樹脂皮膜(２)(２)間のピストン昇降方向に沿う直線状溝部分(７ｃ)を多数備え、多数の直線状溝部分(７ｃ)のピストン昇降側両端開口部(７ａ)(７ｂ)が、ピストン昇降方向(６)で隣合う隣の樹脂皮膜列(５)の多数の樹脂皮膜(２)に向けられている。
この実施形態では、図１(Ａ)に示すように、ピストン昇降方向(６)に複数列配置された樹脂被膜列(５)の被膜列群(５ａ)(５ｂ)は、爆発圧力でピストン(１２)がシリンダ(１４)側に押し付けられるスラスト側(１２ａ)と、スラスト側(１２ａ)と反対側の反スラスト側(１２ｂ)にそれぞれ設けられ、スカート部(１)の周面は、スラスト側(１２ａ)と反スラスト側(１２ｂ)の両被膜列群(５ａ)(５ｂ)間の被膜列群間周面部分(１ｃ)と両被膜列群(５ａ)(５ｂ)の各網目状溝(４)を含む周面部分であって、樹脂被膜(２)が形成されていない一連の被膜無形成周面部分を備えている。
図１(Ｅ)に示す樹脂皮膜(２)の変形例では、樹脂皮膜(２)内に補助オイル溜め溝(１１)が凹設されている。補助オイル溜め溝(１１)は、スカート部(１)の周方向に沿う周方向線状溝とピストン昇降方向(６)に沿う昇降方向線状溝を順に連通させた折線状溝で構成されている。補助オイル溜め溝(１１)は、スポット状に配置された各樹脂皮膜(２)のエリア内に形成され、内底面は、樹脂皮膜(２)で覆われていないスカート部(１)の金属表面で形成されている。
As shown in FIG. 1 (C), a resin film array (5) in which a plurality of resin films (2) are arranged at predetermined intervals in the circumferential direction of the skirt portion (1) is provided. ) Are arranged in a plurality of rows in the piston lifting and lowering direction (6).
In each film row group (5a) (5b) on the thrust side (12a) and the anti-thrust side (12b), it is formed between adjacent resin films (2) (2) in the same resin film row (5). Openings (7a) (7b) at both ends of the piston lift side of the groove portion (7) are directed to the resin film (2) in the adjacent resin film row (5) in the piston lift direction (6). In each film row group (5a) and (5b), the resin film (2) is formed in a regular hexagonal shape with a pair of opposite corners (2a) and (2b) facing the piston ascending / descending direction. 4) is a regular hexagonal network, the piston groove portion of the resin film column of rising side edge (5) (7) is a number widened toward the piston upward direction without resin coating (2), the piston descending end the groove of the resin film column (5) (7) is a number widened toward the piston descending side without resin coating (2).
As shown in FIG. 1 (C), each mesh groove (4) provided in each film row group (5a) (5b) has an adjacent resin film (2) in each resin film row (5). (2) A large number of linear groove portions (7c) are provided along the piston ascending / descending direction, and the piston elevating side opening portions (7a) (7b) of the large number of linear groove portions (7c) ) Are directed to a number of resin films (2) in the adjacent resin film row (5).
In this embodiment, as shown in FIG. 1 (A), the coating row groups (5a) and (5b) of the resin coating row (5) arranged in a plurality of rows in the piston ascending / descending direction (6) 12) are provided on the thrust side (12a) pressed against the cylinder (14) side and the opposite thrust side (12b) opposite to the thrust side (12a), and the peripheral surface of the skirt portion (1) is provided on the thrust side. (12a) and anti-thrust side (12b) both coating row groups (5a) (5b) between the coating row group peripheral surface portion (1c) and each mesh groove of both coating row groups (5a) (5b) ( 4) A peripheral surface portion including 4), which is provided with a series of coating-free peripheral surface portions on which the resin film (2) is not formed.
In the modification of the resin film (2) shown in FIG. 1 (E), an auxiliary oil reservoir groove (11) is recessed in the resin film (2). The auxiliary oil reservoir groove (11) is composed of a folded linear groove in which a circumferential linear groove along the circumferential direction of the skirt portion (1) and an upward / downward linear groove along the piston lifting / lowering direction (6) are communicated in order. Yes. The auxiliary oil sump groove (11) is formed in the area of each resin film (2) arranged in a spot shape, and the inner bottom surface is the metal surface of the skirt portion (1) not covered with the resin film (2). It is formed with.
次に、第１参考形態について説明する。
図２(Ａ)に示すように、スカート部(１)の周方向に複数の樹脂皮膜(２)が所定間隔を置いて配置された樹脂皮膜列(５)を備え、この樹脂皮膜列(５)がピストン昇降方向(６)に複数列配置されている。
複数列の樹脂皮膜列(５)(５)の樹脂皮膜(２)(２)がピストン昇降方向(６)に揃えて配置されることにより、網目状溝(４)が、ピストン昇降方向(６)に沿って一連に伸びる縦溝部分(８)と、スカート部(１)の周方向に沿って一連に伸びる横溝部分(９)とで構成されている。
縦溝部分(８)と横溝部分(９)との交差箇所に網目状溝(４)の他の箇所よりも広幅のオイル溜め溝部分(１０)が形成されている。このため、オイル溜め溝部分(１０)に多くのエンジンオイルが保持され、網目状溝(４)のエンジンオイル保持機能を高めることができる。
オイル溜め溝部分(１０)は、所定の樹脂皮膜列(５)の樹脂皮膜(２)の下部が下窄まり形状とされ、この樹脂皮膜列(５)とピストン下死点側で隣合う樹脂皮膜列(５)の樹脂皮膜(２)の上部が上窄まり形状とされ、形成されている。
図１(Ｅ)に示す樹脂皮膜(２)の変形例と同様、樹脂皮膜(２)内に補助オイル溜め溝(１１)が凹設されている。
他の構成は、実施形態と同じであり、図２(Ａ)(Ｂ)中、実施形態と同一の要素には、図１(Ａ)〜(Ｅ)と同一の符号を付しておく。
Next, the first reference embodiment will be described.
As shown in FIG. 2 (A), a resin film array (5) in which a plurality of resin films (2) are arranged at predetermined intervals in the circumferential direction of the skirt portion (1) is provided. ) Are arranged in a plurality of rows in the piston lifting and lowering direction (6).
By arranging the resin coatings (2) and (2) of the plurality of resin coating rows (5) and (5) in alignment with the piston lifting / lowering direction (6), the mesh grooves (4) are formed in the piston lifting / lowering direction (6 ) And a lateral groove portion (9) extending in series along the circumferential direction of the skirt portion (1).
An oil reservoir groove portion (10) that is wider than the other portions of the mesh groove (4) is formed at the intersection of the vertical groove portion (8) and the horizontal groove portion (9). Therefore, a lot of engine oil is retained in the oil sump groove portion (10), and the engine oil retaining function of the mesh groove (4) can be enhanced.
The oil sump groove portion (10) has a shape in which the lower part of the resin film (2) of the predetermined resin film row (5) is constricted, and the resin film row (5) is adjacent to the piston at the bottom dead center side. The upper part of the resin film (2) of the film row (5) is formed in a constricted shape.
As in the modification of the resin film (2) shown in FIG. 1 (E), an auxiliary oil reservoir groove (11) is provided in the resin film (2).
Other configurations are the same as those of the embodiment, and in FIGS. 2A and 2B, the same elements as those of the embodiment are denoted by the same reference numerals as those of FIGS.
次に第２参考形態について説明する。
図３(Ａ)(Ｂ)に示すように、スカート部(１)の表面に樹脂皮膜(２)と凹部(３)とを備えたエンジンのピストン(１２)において、図３(Ａ)に示すように、スカート部(１)の表面にピストン昇降方向(６)に伸びる縦縞の樹脂皮膜(２)が配置され、隣合う樹脂皮膜(２)(２)の間に形成される凹部(３)でピストン昇降方向(６)に伸びる縦縞の縦縞溝(１３)が形成され、縦縞溝(１３)のピストン昇降側両端部(１３ａ)(１３ａ)がスカート部(１)のピストン昇降側両端縁部(１ａ)(１ｂ)寄りの樹脂皮膜(２)で閉じられている。このため、ピストン(１２)の昇降時に縦縞溝(１３)のピストン昇降側両端部(１３ａ)(１３ａ)の樹脂皮膜(２)を乗り越えるだけで、縦縞溝(１３)内、すなわち凹部(３)内にエンジンオイルが供給され、凹部(３)へのエンジンオイルの供給が改善される。このため、凹部(３)に十分な量のエンジンオイルが保持され、エンジンオイルによるスカート部(１)の摩擦低減機能が高まる。また、スカート部(１)の広域に亘って、エンジンオイルの保持領域を形成することができる。
樹脂皮膜(２)は、方形枠内を複数の縦桟で区画した形状で、縦縞溝(１３)は、樹脂皮膜(２)の縦桟の間に形成され、内底面は、樹脂皮膜(２)で覆われていないスカート部(１)の金属表面で形成されている。
他の構成は、実施形態と同じであり、図３(Ａ)(Ｂ)中、実施形態と同一の要素には、図１(Ａ)〜(Ｅ)と同一の符号を付しておく。
Next, a second reference embodiment will be described.
As shown in FIGS. 3 (A) and 3 (B), the piston (12) of the engine having a resin film (2) and a recess (3) on the surface of the skirt (1) is shown in FIG. 3 (A). As described above, a vertically striped resin film (2) extending in the piston lifting and lowering direction (6) is disposed on the surface of the skirt portion (1), and the recess (3) formed between the adjacent resin films (2) and (2). A vertical stripe groove (13) extending in the piston lifting and lowering direction (6) is formed, and both ends (13a) and (13a) of the piston raising and lowering side of the vertical stripe groove (13) are both edges of the piston raising and lowering side of the skirt (1). (1a) Closed by a resin film (2) close to (1b). For this reason, when the piston (12) is moved up and down, the resin strip (2) on both ends (13a) and (13a) of the vertical stripe groove (13) of the vertical stripe groove (13) is simply overcome and the recess (3) The engine oil is supplied to the inside, and the supply of the engine oil to the recess (3) is improved. For this reason, a sufficient amount of engine oil is retained in the recess (3), and the function of reducing friction of the skirt (1) by the engine oil is enhanced. Further, the engine oil holding region can be formed over a wide area of the skirt portion (1).
The resin film (2) has a shape in which a rectangular frame is partitioned by a plurality of vertical bars, and the vertical stripe grooves (13) are formed between the vertical bars of the resin film (2). ) Is formed on the metal surface of the skirt portion (1) not covered with.
Other configurations are the same as those of the embodiment, and in FIGS. 3A and 3B, the same reference numerals as those of FIGS. 1A to 1E are attached to the same elements as those of the embodiment.
(１) スカート部
(１ａ)(１ｂ) ピストン昇降側両端縁部
(１ｃ) 被膜列群間周面部分
(２) 樹脂皮膜
(２ａ)(２ｂ) 角部
(３) 凹部
(４) 網目状溝
(４ａ)(４ｂ) ピストン昇降側両端開口部
(５) 樹脂皮膜列
(５ａ) 被膜列群
(５ｂ) 被膜列群
(６) ピストン昇降方向
(７) 溝部分
(７ａ)(７ｂ) ピストン昇降側両端開口部
(７ｃ) 直線状溝部分
(８) 縦溝部分
(９) 横溝部分
(１０) オイル溜め溝部分
(１１) 補助オイル溜め溝
(１３) 縦縞溝
(１３ａ)(１３ｂ) ピストン昇降側両端部
(1) Skirt
(1a) (1b) Piston lift side end edges
(1c) Peripheral surface portion between film rows
(2) Resin film
(2a) (2b) Corner
(3) Concave
(4) Reticulated grooves
(4a) (4b) Piston lift side opening at both ends
(5) Resin film train
(5a) Film row group
(5b) Film row group
(6) Piston lifting direction
(7) Groove part
(7a) (7b) Piston lift side opening at both ends
(7c) Straight groove
(8) Vertical groove
(9) Horizontal groove part
(10) Oil reservoir groove
(11) Auxiliary oil reservoir groove
(13) Vertical stripe groove
(13a) (13b) Both ends of the piston lift side
Claims (3)
スカート部(１)の表面にスポット状に複数の樹脂皮膜(２)が配置され、樹脂皮膜(２)(２)同士の間に形成される凹部(３)で網目状溝(４)が形成され、
スカート部(１)の周方向に複数の樹脂皮膜(２)が所定間隔を置いて配置された樹脂皮膜列(５)を備え、この樹脂皮膜列(５)がピストン昇降方向(６)に複数列配置され、
このピストン昇降方向(６)に複数列配置された樹脂被膜列(５)の被膜列群(５ａ)(５ｂ)は、爆発圧力でピストン(１２)がシリンダ(１４)側に押し付けられるスラスト側(１２ａ)と、スラスト側(１２ａ)と反対側の反スラスト側(１２ｂ)にそれぞれ設けられ、
各被膜列群(５ａ)(５ｂ)では、同じ樹脂皮膜列(５)の隣合う樹脂皮膜(２)(２)同士の間に形成される溝部分(７)のピストン昇降側両端開口部(７ａ)(７ｂ)が、ピストン昇降方向(６)で隣合う隣の樹脂皮膜列(５)の樹脂皮膜(２)に向けられ、
各被膜列群(５ａ)(５ｂ)では、樹脂皮膜(２)は相互反対側の一対の角部(２ａ)(２ｂ)をピストン昇降方向に向けた正六角形状に形成され、網目状溝(４)は正六角形状の網目で、ピストン昇側端の樹脂被膜列(５)の溝部分(７)は樹脂被膜(２)の無いピストン昇方向に向けて多数拡開され、ピストン降側端の樹脂被膜列(５)の溝部分(７)は樹脂被膜(２)の無いピストン降側に向けて多数拡開され、
各皮膜列群(５ａ)(５ｂ)にそれぞれ設けられる各網目状溝(４)は、各樹脂被膜列(５)内に、隣り合う樹脂皮膜(２)(２)間のピストン昇降方向に沿う直線状溝部分(７ｃ)を多数備え、多数の直線状溝部分(７ｃ)のピストン昇降側両端開口部(７ａ)(７ｂ)が、ピストン昇降方向(６)で隣合う隣の樹脂皮膜列(５)の多数の樹脂皮膜(２)に向けられている、ことを特徴とするエンジンのピストン。 In an engine piston having a resin film (2) and a recess (3) on the surface of a skirt (1),
A plurality of resin films (2) are arranged in a spot shape on the surface of the skirt part (1), and a mesh groove (4) is formed by a recess (3) formed between the resin films (2) and (2). And
A resin film row (5) in which a plurality of resin films (2) are arranged at predetermined intervals in the circumferential direction of the skirt portion (1) is provided, and a plurality of resin film rows (5) are arranged in the piston ascending / descending direction (6). Arranged in columns,
The coating row groups (5a) and (5b) of the resin coating row (5) arranged in a plurality of rows in the piston ascending / descending direction (6) are arranged on the thrust side where the piston (12) is pressed against the cylinder (14) side by the explosion pressure ( 12a) and the thrust side (12a) opposite to the thrust side (12b),
In each film row group (5a) (5b), both ends of the piston lift side of the groove portion (7) formed between adjacent resin films (2) and (2) of the same resin film row (5) ( 7a) and 7b are directed to the resin film (2) of the adjacent resin film row (5) adjacent in the piston ascending / descending direction (6),
In each film row group (5a) and (5b), the resin film (2) is formed in a regular hexagonal shape with a pair of opposite corners (2a) and (2b) facing the piston ascending / descending direction. 4) is a regular hexagonal network, the piston groove portion of the resin film column of rising side edge (5) (7) is a number widened toward the piston upward direction without resin coating (2), the piston descending end The groove part (7) of the resin film row (5) is expanded in a large number toward the piston descending side without the resin film (2),
Each mesh-like groove (4) provided in each film row group (5a) (5b) is provided in the resin film row (5) along the piston ascending / descending direction between adjacent resin films (2) (2). A number of linear groove portions (7c) are provided, and the piston lift side end openings (7a), (7b) of the multiple linear groove portions (7c) are adjacent to each other in the piston lift direction (6). 5) A piston for an engine, which is directed to a number of resin films (2).
スカート部(１)の周面は、スラスト側(１２ａ)と反スラスト側(１２ｂ)の両被膜列群(５ａ)(５ｂ)間の被膜列群間周面部分(１ｃ)と両被膜列群(５ａ)(５ｂ)の各網目状溝(４)を含む周面部分であって、樹脂被膜(２)が形成されていない一連の被膜無形成周面部分を備えている、ことを特徴とするエンジンのピストン。 The piston of the engine according to claim 1,
The peripheral surface of the skirt portion (1) is a peripheral portion (1c) between the coating row groups between the coating row groups (5a) and (5b) on the thrust side (12a) and the anti-thrust side (12b), and both coating row groups. (5a) A peripheral surface portion including the mesh grooves (4) of (5b), and having a series of coating-free peripheral surface portions on which the resin film (2) is not formed. The piston of the engine that does.
樹脂皮膜(２)内に補助オイル溜め溝(１１)が凹設され、
補助オイル溜め溝(１１)は、スカート部(１)の周方向に沿う周方向線状溝とピストン昇降方向(６)に沿う昇降方向線状溝を順に連通させた折線状溝で構成されている、ことを特徴とするエンジンのピストン。 The engine piston according to claim 1 or 2 ,
An auxiliary oil reservoir groove (11) is recessed in the resin film (2),
The auxiliary oil reservoir groove (11) is composed of a folded linear groove in which a circumferential linear groove along the circumferential direction of the skirt portion (1) and an upward / downward linear groove along the piston lifting / lowering direction (6) are communicated in order. The piston of the engine characterized by that.
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