WO2012105538A1 - 組合せピストンリング - Google Patents
組合せピストンリング Download PDFInfo
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- WO2012105538A1 WO2012105538A1 PCT/JP2012/052098 JP2012052098W WO2012105538A1 WO 2012105538 A1 WO2012105538 A1 WO 2012105538A1 JP 2012052098 W JP2012052098 W JP 2012052098W WO 2012105538 A1 WO2012105538 A1 WO 2012105538A1
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- WIPO (PCT)
- Prior art keywords
- piston ring
- coating
- combustion chamber
- ring body
- combined
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
- F16J9/14—Joint-closures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
- F16J9/061—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging using metallic coiled or blade springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/28—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction of non-metals
Definitions
- the present invention relates to a piston ring for an internal combustion engine, and more particularly to a combination piston ring excellent in gas sealing performance.
- Pistons used in internal combustion engines such as automobile engines are generally provided on the outer periphery of the piston in order to obtain gas sealability, oil sealability, and heat transfer to the cylinder bore when sliding inside the cylinder bore.
- a substantially annular metal piston ring is arranged in the ring groove. Normally, three piston rings are mounted in the ring groove and used, but the piston ring is notched (hereinafter referred to as “abutment”) for generating an outer peripheral tension and for expansion when the piston ring is mounted. ) Is provided at a part of the circumference.
- double angle joint As a means of reducing the leakage of combustion gas (hereinafter referred to as “blow-by gas”), a special piston called “double angle joint” (Japanese Utility Model Publication No. 59-126158) is used as a metal piston ring. A structure that reduces the leakage area is used.
- the processing of the double angle joint is complicated and difficult, and there are problems such as an increase in processing cost and breakage of the joint.
- Japanese Utility Model Publication No. 4-41153 discloses a synthetic resin piston ring in which a stepped joint is formed. This joint shape is relatively easily formed by pressing with a thin blade cutter. Further, as a seal ring used for an oil seal of a transmission or the like, a seal ring having a triple step shape joint formed by injection molding is used (Japanese Patent Laid-Open No. 2003-1584).
- the object of the present invention is to use a resin material that enables industrial formation of a special joint effective for blow-by countermeasures, and even if it receives combustion gas from the combustion chamber side, it is localized on the side surface of the combustion chamber. It is to provide a piston ring that does not deform or melt. That is, an object is to provide a combined piston ring that is particularly excellent in gas sealing performance.
- the combined piston ring of the present invention comprises a piston ring body made of high-strength heat-resistant resin and having a step shape when viewed from the upper and lower side surfaces and the outer peripheral surface (hereinafter referred to as “triple step joint shape”), and the piston ring body.
- a combination piston ring comprising a spring that is mounted on an inner periphery and presses the piston ring body outward in the radial direction has a heat-resistant coating on at least a side surface of the piston ring body on the combustion chamber side.
- the resin constituting the piston ring main body is made of a high-strength heat-resistant resin, and the film formed on the side surface of the piston ring main body on the combustion chamber side also receives combustion gas. It is necessary to have heat resistance higher than that of the piston ring main body that can sufficiently withstand. From the viewpoint of releasing the heat energy from the combustion gas to the cylinder instead of the piston ring body, a coating with high thermal conductivity is suitable, and conversely, from the viewpoint of not transferring the heat energy from the combustion gas to the piston ring body, A film with low conductivity is suitable.
- the high-strength heat-resistant resin that constitutes the piston ring body can be used as long as it is a super engineering plastic with excellent heat resistance.
- the coating formed on the combustion chamber side surface of the piston ring main body can be a general metal coating from the viewpoint of releasing the heat energy from the combustion gas to the cylinder instead of the piston ring main body.
- a metal film by electroless plating that can be applied even to unusable resins can be used conveniently.
- a metal plating film of Cu or Ni is preferable, and P, Co, Cr, Mo, Ti, SiC, Si 3 N 4 , Al 2 O 3 , B 4 C, diamond, PTFE (polytetrafluoroethylene) on Cu or Ni
- a composite plating film in which at least one selected from the group consisting of BN, graphite and the like is combined is more preferable because it is provided with wear resistance.
- the coating contains diamond like carbon (also referred to as “DLC”).
- the coating coated on the side surface of the combustion chamber is in direct contact with the cylinder wall. It is preferable to coat the film of the same material integrally with the film. Of course, it is also preferable to cover the entire surface of the piston ring.
- a coating film of super engineering plastic that has heat resistance and low thermal conductivity can be used, especially polybenzimidazole (PBI) and / or Alternatively, a resin film containing polyimide (PI) or a film containing organopolysiloxane (P-Si) is preferable.
- a metal having a width thinner than the width of the piston ring body is provided on the combustion chamber side surface of the piston ring body having a coating on the combustion chamber side surface of the piston ring body. It is preferable to further arrange a piston ring.
- the combined piston ring of the present invention has a triple step-shaped special abutment portion that becomes a step shape when viewed from the upper and lower side surfaces and the outer peripheral surface, so that the gas leakage area from the abutment can be remarkably reduced, and the piston ring
- the main body is made of a high-strength heat-resistant resin that can be injection-molded, problems such as an increase in processing costs and breakage of the joint portion can be solved.
- the piston ring body has a coating with sufficient heat resistance on the combustion chamber side surface, the heat load on the piston ring body due to combustion gas is reduced, and local deformation and It is possible to avoid the problem of melting and to provide a combined piston ring that is extremely excellent in gas sealing performance.
- FIG. 5 is a view showing a combined piston ring of the present invention in which a thin metal piston ring is further disposed on a combustion chamber side side surface of a piston ring body and a spring that presses the piston ring body is a coil spring, which is mounted in a piston ring groove. is there.
- the piston ring main body 1 of the combination piston ring of the present invention has an abutment portion 2 having a step shape when viewed from the upper and lower side surfaces and the outer peripheral surface.
- This abutment shape is a so-called triple (three places, upper and lower side surfaces and outer peripheral surface) step shape shown in FIG. 1, and is a geometrically completely cut off abutment shape. Therefore, the blow-by gas can be extremely reduced, and a piston ring excellent in gas sealing performance can be provided. Since it is extremely difficult to form such a complicated joint portion with a metal piston ring, in the present invention, a high-strength heat-resistant resin is used instead of metal.
- high-strength heat-resistant resin super engineering plastics represented by polyether ether ketone (PEEK) and polyphenylene sulfide (PPS) can be used, and polybenzimidazole (PBI) having higher heat resistance can also be preferably used.
- PEEK polyether ether ketone
- PPS polyphenylene sulfide
- PBI polybenzimidazole
- These high-strength heat-resistant resins can be injection-molded, and complex joints can be easily formed. Of course, it is also possible to compress the powder into a ring shape and form the abutment portion with a thin blade cutter.
- the high-strength heat-resistant resin can further enhance heat resistance and increase strength by including carbon fiber or glass fiber. That is, a high-strength heat-resistant resin reinforced with fibers can be obtained.
- the blending ratio of such carbon fiber or glass fiber is preferably 10 to 40% by weight.
- FIG. 2 (a) and 2 (b) show a situation where the combined piston ring of the present invention is mounted in the ring groove 5 of the piston 6 and inserted into the bore of the cylinder 7.
- FIG. The combined piston ring of the present invention comprises a piston ring body 1 and a spring 4 (4 ′) that presses the piston ring body 1 radially outward, and has a coating 3 on the side surface of the piston ring body on the combustion chamber side.
- the spring 4 (4 ') is shown as a leaf spring 4 in FIG. 2 (a) and a coil spring 4' in FIG. 2 (b), but if there is a function of pressing the piston ring body 1 radially outward, It is not limited to.
- the outer peripheral surface 1 of the piston ring main body that slides on the cylinder wall 7 can have various shapes such as a barrel face, a tapered face, and the like depending on the application as well as a straight shape.
- the barrel face is preferable when used for the top ring (first piston ring counted from the combustion chamber side), and the taper is used when used for the second ring (second piston ring counted from the combustion chamber side).
- a face is preferred.
- the coating 3 on the side surface on the combustion chamber side of the piston ring body 1 needs to have heat resistance higher than that of the piston ring body 1 that can sufficiently withstand combustion gas. Furthermore, from the viewpoint of releasing the heat energy from the combustion gas to the cylinder bore instead of the piston ring body 1, a coating having high thermal conductivity is suitable, and conversely, the heat energy from the combustion gas is not transmitted to the piston ring body 1. From the viewpoint, a film having low thermal conductivity is suitable. Whichever film is used, the film 3 can be formed by coating, spraying, dipping, plating, physical vapor deposition, chemical vapor deposition, or the like.
- electroless plating can be used particularly conveniently, and the above-described Cu or Ni metal plating film, or P on Cu or Ni, A composite of at least one selected from the group consisting of Co, Cr, Mo, Ti, SiC, Si 3 N 4 , Al 2 O 3 , B 4 C, diamond, PTFE (polytetrafluoroethylene), BN, and graphite.
- a composite plating film is preferred.
- the thickness of the electroless plating film is preferably 1 to 50 ⁇ m, more preferably 5 to 30 ⁇ m.
- DLC can be coated by physical vapor deposition or chemical vapor deposition, and those with a low hydrogen content that are structurally close to diamond are formed by physical vapor deposition. In view of productivity, it is preferable to form by chemical vapor deposition.
- the thickness of the DLC film is preferably from 0.1 to 10 ⁇ m, more preferably from 2 to 7 ⁇ m.
- FIG. 3 is an embodiment from the viewpoint of releasing the heat energy from the combustion gas not to the piston ring body 1 but to the cylinder wall 7, and the outer peripheral surface of the piston ring body 1 is integrated with the coating 3 on the side surface of the combustion chamber. Is coated with the same film 3 '.
- Polybenzimidazole (PBI), polyimide (PI), and organopolysiloxane (P-Si) films which have low thermal conductivity, are coated by coating, spraying, dipping, or the like.
- the thickness of the film 3 is preferably 0.5 to 50 ⁇ m, more preferably 1 to 30 ⁇ m.
- the application portion of the coating 3 is at least the side surface on the combustion chamber side, but of course, other surfaces except the outer peripheral surface may be covered. It may be determined in consideration of productivity and the like.
- the outer peripheral surface which is a severe sliding surface, can be appropriately coated with a wear resistant coating. It is not necessary to use the same material as the coating 3 on the side surface of the combustion chamber.
- FIG. 4 (a) and 4 (b) show a situation in which a metal piston ring 8 having a width smaller than the width of the piston ring main body is further arranged on the combustion chamber side surface of the combination piston ring of the present invention. .
- the arrangement of the thin metal piston ring 8 makes it possible to significantly reduce the heat load on the piston ring body 1, so that this combined piston ring is preferably applied to, for example, the top ring in particularly severe cases.
- a piston ring having almost no tension which is known as a side rail of a combined oil ring, can be used.
- FIG. 4 (a) is an example in which a leaf spring is used as a spring, and is an example in which not only the piston ring body but also a thin metal piston ring 8 has a width that can be pressed radially outward.
- the outer peripheral seal portion can be of a double structure, and blow-by gas can be significantly reduced.
- FIG. 4B shows an example in which the thin metal piston ring 8 cannot be pressed outward in the radial direction and only has a function of thermally shielding the combustion chamber side surface of the piston ring body. From the viewpoint of releasing the heat energy from the combustion gas to the cylinder bore, it is preferable that the thin metal piston ring 8 is also pressed radially outward to come into contact with the cylinder wall.
- Example 1 Carbon fiber was blended with powdered polyetheretherketone (PEEK), and a predetermined amount of pellets were prepared in an extruder. Next, injection molding was performed on the piston ring having the abutment triple step shape and the outer peripheral straight shape using the pellets under predetermined conditions.
- the surface roughness of the side surface of the piston ring was 0.4 ⁇ m in terms of arithmetic average roughness (Ra).
- Ra arithmetic average roughness
- Comparative Example 1 (C1) Using the top ring (a barrel face with an outer peripheral CrN film, an abutment straight shape, an abutment gap of 0.25 mm) originally set in the engine, the blow-by amount in the engine test (1) was measured. The result was set to 100 as described above. About 8 times as much blow-by amount as in Example 1 was observed.
- Comparative Example 2 (C2) The engine experiment (2) was carried out on a piston ring having a triple step joint shape made of the same carbon fiber reinforced PEEK material as in Example 1 except that nothing was coated on the side surface of the piston ring. After completion, the piston ring was taken out and observed, and as a result, peeling and unevenness were observed on the surface.
- the Rz values before and after the test on the side surface of the combustion chamber were 2.1 ⁇ m and 18.4 ⁇ m, respectively.
- Examples 2 to 3 Triple step of carbon fiber reinforced PEEK material in the same manner as in Example 1 except that instead of Ni-P electroless plating, Cu electroless plating and Si 3 N 4 dispersed Ni-P electroless composite plating were used.
- a piston-shaped piston ring was produced.
- Example 4 Carbon fiber in the same way as in Example 1 except that instead of Ni-P electroless plating, a diamond-like carbon (DLC) film was formed by plasma CVD using CH 4 gas as raw material and H 2 gas as carrier gas. A piston ring with a triple-step joint made of reinforced PEEK material was fabricated. As a method for forming a DLC film on one side of the piston ring, a jig similar to the electroless plating jig used in Example 1 was used. However, a heat resistant tape was used as the tape for sealing the outer periphery. Table 1 shows the test results of the engine experiment (1) and the engine experiment (2) as in Examples 2-3.
- DLC diamond-like carbon
- Examples 5 to 6 (E5 to E6) A triple step piston ring of carbon fiber reinforced PEEK material in which the Si 3 N 4 dispersed Ni—P coating and the DLC coating formed on the side surfaces of Example 3 and Example 4 were also coated on the outer peripheral surface was produced.
- the film thickness of electroless plating was almost the same on the outer peripheral surface and the side surface, but the outer peripheral surface of DLC was about 1.7 times thicker.
- Table 1 shows the test results of the engine experiment (1) and the engine experiment (2) as in Examples 2 to 4.
- Examples 7 to 8 Example 1 except that instead of Ni-P electroless plating, a resin film in which 10% by mass of molybdenum disulfide was dispersed using polybenzimidazole (PBI) and polyamide (PA) as a binder was formed by metal mask printing. In the same manner, a triple-step abutment-shaped piston ring made of carbon fiber reinforced PEEK material was produced.
- Table 1 shows the test results of the engine experiment (1) and the engine experiment (2).
- the blow-by amount is 13 or less at 4,000 rpm, assuming that Comparative Example 1 is 100. This is a significant reduction compared to the straight jointed steel ring of Comparative Example 1 (C1) It was done. Piston rings with Ni-P, Cu, Si 3 N 4 dispersed Ni-P electroless plating, DLC film, or PBI, PA resin film on the combustion chamber side surface of the piston ring are relatively harsh. In the condition engine test, the test could be completed without any particular damage to the surface and no significant increase in surface roughness. When the film was formed not only on the side surface of the piston ring but also on the outer peripheral surface, the blow-by amount was further reduced.
- Example 9 Same size and shape as in Examples 1 to 8 (E1 to E8), but the shape is a triple step shape and outer barrel shape, except that a groove that can accommodate a coil spring is formed on the inner circumference side.
- a piston ring having the same Si 3 N 4 dispersed Ni—P coating as that in Example 3 formed on the side surface was produced.
- the film thickness was 15 ⁇ m.
- a coil spring that generates a tension of about 5 N was set on the inner periphery of the piston ring and mounted on the engine.
- the blow-by amount in Comparative Example 1 was 100, the blow-by amount was 15, and the surface roughness (Rz) before and after the test was 2.4 ⁇ m and 2.5 ⁇ m.
- Example 10 From the carbon fiber / PEEK composite material pellets used in Example 1, the piston ring used in Example 1 had a width dimension of 4/5, and a piston ring having an abutment triple step shape and an outer barrel shape was injection molded. A Si 3 N 4 / Ni-P composite plating film was formed on one side surface of the piston ring in the same manner as in Example 3. Further, a martensitic stainless steel thin piston ring having a width dimension of 1/4 of the lower piston ring width dimension, which is similar to the side rail of the combined oil control ring, was prepared and used in Examples 1 to 8. The engine used in Examples 1 to 9 was mounted in combination with a leaf spring. As in Examples 1 to 9, engine experiment (1) and engine experiment (2) were conducted. As a result, when Comparative Example 1 was set to 100, the blow-by amount was about 9, and the surface roughness (Rz before and after the test) ) was 2.1 ⁇ m and 2.1 ⁇ m.
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Abstract
Description
粉末状ポリエーテルエーテルケトン(PEEK)に炭素繊維を配合し、押出機においてペレットを所定量作製した。次に、合口トリプルステップ形状、外周ストレート形状のピストンリングに、所定の条件にて前記ペレットを用いて射出成形した。ここで、ピストンリング側面の表面粗さは、算術平均粗さ(Ra)で0.4 μmであった。得られたピストンリングを2枚ずつ重ね合わせ、ピストンリング側面の一方がめっき液に触れるように所定の治具に合計50枚セットし、さらに外周面をテープでシールし、Ni-Pの無電解めっきを行った。Ni-P皮膜の厚さは約20μmであった。これにより、一方の側面にNi-P皮膜が形成された炭素繊維強化PEEK材のトリプルステップ合口形状のピストンリングが作製された。
水冷4サイクルの自然吸気式ガソリンエンジンを用いて、Ni-P皮膜が燃焼室側に配置されるように、且つ約5Nの張力が働くように内周側に板バネをセットした実施例1のピストンリングをピストンのトップリング溝(セカンドリング及びオイルリングについては前記エンジンにセットされていたものを使用)に装着し、ブローバイ量の測定を行った。運転条件は、4,000rpm、全負荷(WOT: Wide Open Throttle)条件とした。後述する比較例1のブローバイ量を100とするとき、実施例1のブローバイ量は約12となり、約1/8に低減することが確認された。
エンジン試験(1)の終了後、実施例1のピストンリングをセットしたまま、5000rpm、全負荷で48時間連続運転の耐久試験を行った。終了後、ピストンリングを取り出し観察したが、特に表面に凹凸等の損傷は見られなかった。また、燃焼室側側面の表面粗さについて、試験前と試験後の10点平均粗さ(Rz)を測定した結果、それぞれ、3.1μmと3.3μmであった。
上記エンジンに本来セットされていたトップリング(外周CrN皮膜付バレルフェース、合口ストレート形状、合口隙間0.25 mm)を用いて、上記エンジン試験(1)によるブローバイ量の測定を行った。その結果を前述したように100とした。実施例1に比べ約8倍のブローバイ量が観察された。
ピストンリング側面に何も被覆しないこと以外は実施例1と同じ炭素繊維強化PEEK材のトリプルステップ合口形状のピストンリングについて、上記エンジン実験(2)を行った。終了後、ピストンリングを取り出し観察した結果、表面にむしれや凹凸が観察された。燃焼室側側面の試験前と試験後のRzは、それぞれ、2.1μmと18.4μmであった。
Ni-Pの無電解めっきの代わりに、Cuの無電解めっき及びSi3N4を分散したNi-P無電解複合めっきとした以外は実施例1と同様にして炭素繊維強化PEEK材のトリプルステップ合口形状のピストンリングを作製した。実施例2~3の皮膜種類、皮膜厚さ、エンジン実験(1)の4,000 rpmにおけるブローバイ量、エンジン実験(2)によるピストンリング燃焼室側側面の試験前及び試験後の表面粗さRzと外観観察結果について、実施例1及び比較例2の結果とともに、表1に示す。なお、各実施例のブローバイ量は、比較例1のブローバイ量を100として、それぞれ比率換算したものである。
Ni-Pの無電解めっきの代わりに、CH4ガスを原料、H2ガスをキャリアガスとしてプラズマCVDによるダイヤモンドライクカーボン(DLC)皮膜を形成した以外は、実施例1と同様にして、炭素繊維強化PEEK材のトリプルステップ合口形状のピストンリングを作製した。ピストンリングの一方の側面にDLC皮膜を形成する方法としては、実施例1で使用した無電解メッキ用の治具に類似の治具を用いた。但し、外周をシールするテープには耐熱テープを用いた。実施例2~3と同様に、エンジン実験(1)及びエンジン実験(2)による試験結果を表1に示す。
実施例3及び実施例4の側面に形成したSi3N4分散Ni-P皮膜及びDLC皮膜が、外周面にも被覆された炭素繊維強化PEEK材のトリプルステップ形状のピストンリングを作製した。無電解めっきの皮膜厚さは外周面も側面もほぼ同じ厚さであったが、DLCについては外周面のほうが約1.7倍厚かった。実施例2~4と同様に、エンジン実験(1)及びエンジン実験(2)による試験結果を表1に示す。
Ni-Pの無電解メッキの代わりに、ポリベンゾイミダゾール(PBI)、ポリアミド(PA)をバインダーとして二硫化モリブデンを10質量%分散した樹脂皮膜をメタルマスク印刷により形成した以外は、実施例1と同様にして炭素繊維強化PEEK材のトリプルステップ合口形状のピストンリングを作製した。実施例2~6と同様に、エンジン実験(1)及びエンジン実験(2)による試験結果を表1に示す。
実施例1~8(E1~E8)と同じ寸法及び形状のもので、合口トリプルステップ形状、外周バレル形状ではあるが、内周側にコイルバネを収容できる溝が形成された形状とした以外は実施例1と同様にして、実施例3と同じSi3N4分散Ni-P皮膜を側面に形成したピストンリングを作製した。皮膜の厚さは15μmであった。約5Nの張力が生じるようなコイルバネをピストンリングの内周にセットして、エンジンに装着し、実施例1~8と同様に、エンジン実験(1)及びエンジン実験(2)を行った結果、比較例1のブローバイ量を100とするとき、ブローバイ量は15となり、試験前と試験後の表面粗さ(Rz)は2.4μmと2.5μmであった。
実施例1で用いた炭素繊維/PEEK複合材料のペレットから、実施例1で用いたピストンリングの幅寸法を4/5とし、合口トリプルステップ形状、外周バレル形状のピストンリングを射出成形した。このピストンリングの一方の側面に実施例3と同じようにSi3N4/Ni-P複合めっき皮膜を形成した。さらに、組合せオイルコントロールリングのサイドレールに類似の、下部のピストンリング幅寸法の1/4の幅寸法を有するマルテンサイト系ステンレス鋼製薄幅ピストンリングを用意し、実施例1~8で用いた板バネと組み合わせて、実施例1~9に用いたエンジンに装着した。実施例1~9と同様に、エンジン実験(1)及びエンジン実験(2)を行った結果、比較例1を100とすると、ブローバイ量は約9、試験前と試験後の表面粗さ(Rz)は2.1μmと2.1μmであった。
Claims (8)
- 高強度耐熱樹脂からなり上下側面及び外周面からみてステップ形状となる合口部を有するピストンリング本体と、前記ピストンリング本体の内周部に装着されて前記ピストンリング本体を半径方向外方に押圧するバネとからなる組合せピストンリングにおいて、少なくとも前記ピストンリング本体の燃焼室側側面に皮膜を有することを特徴とする組合せピストンリング。
- 前記ピストンリング本体を構成する前記高強度耐熱樹脂がポリエーテルエーテルケトン、ポリフェニレンサルファイド、ポリベンゾイミダゾールからなるグループから選択された少なくとも一つを含む樹脂であることを特徴とする請求項1に記載の組合せピストンリング。
- 前記ピストンリング本体を構成する前記高強度耐熱樹脂がカーボン繊維又はガラス繊維で強化されたことを特徴とする請求項2に記載の組合せピストンリング。
- 前記皮膜がCu若しくはNiの金属めっき皮膜又はCu若しくはNiにP、Co、Cr、Mo、Ti、SiC、Si3N4、Al2O3、B4C、ダイヤモンド、PTFE、BN、黒鉛からなるグループから選択された少なくとも一つを複合した複合めっき皮膜であることを特徴とする請求項1に記載の組合せピストンリング。
- 前記皮膜がダイヤモンドライクカーボンを含むことを特徴とする請求項1に記載の組合せピストンリング。
- 前記ピストンリング本体の外周面に前記皮膜と同材質の皮膜を被覆することを特徴とした請求項4又は5に記載の組合せピストンリング。
- 前記皮膜がポリベンゾイミダゾール、ポリイミド、オルガノポリシロキサンからなるグループから選択された少なくとも一つを含む皮膜であることを特徴とする請求項1に記載の組合せピストンリング。
- 前記ピストンリング本体の燃焼室側側面に前記ピストンリング本体の幅よりも薄幅の金属製ピストンリングをさらに配置したことを特徴とする請求項1に記載の組合せピストンリング。
Priority Applications (5)
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CN201280007530.8A CN103339422B (zh) | 2011-02-03 | 2012-01-31 | 组合活塞环 |
US13/983,529 US20130305918A1 (en) | 2011-02-03 | 2012-01-31 | Combined piston ring |
MX2013009015A MX2013009015A (es) | 2011-02-03 | 2012-01-31 | Anillo de piston combinado. |
BR112013019833-8A BR112013019833A2 (pt) | 2011-02-03 | 2012-01-31 | anel de pistão combinado |
EP12742580.9A EP2672151B1 (en) | 2011-02-03 | 2012-01-31 | Combined piston ring |
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JP2011-021674 | 2011-02-03 | ||
JP2011021674A JP5658585B2 (ja) | 2011-02-03 | 2011-02-03 | 組合せピストンリング |
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WO2012105538A1 true WO2012105538A1 (ja) | 2012-08-09 |
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PCT/JP2012/052098 WO2012105538A1 (ja) | 2011-02-03 | 2012-01-31 | 組合せピストンリング |
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US (1) | US20130305918A1 (ja) |
EP (1) | EP2672151B1 (ja) |
JP (1) | JP5658585B2 (ja) |
CN (1) | CN103339422B (ja) |
BR (1) | BR112013019833A2 (ja) |
MX (1) | MX2013009015A (ja) |
WO (1) | WO2012105538A1 (ja) |
Cited By (1)
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US20220195136A1 (en) * | 2020-12-17 | 2022-06-23 | Mazda Motor Corporation | Addition-curing silicone resin for producing heat-shielding film, method for forming heat-shielding film on inner surface of combustion chamber of engine by means of addition-curing silicone resin, heat-shielding film, and heat shielding method for reducing or preventing heat dissipation from combustion chamber of engine to outside by means of heat-shielding film |
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Also Published As
Publication number | Publication date |
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JP2012163118A (ja) | 2012-08-30 |
US20130305918A1 (en) | 2013-11-21 |
BR112013019833A2 (pt) | 2020-11-17 |
EP2672151A1 (en) | 2013-12-11 |
MX2013009015A (es) | 2013-08-29 |
EP2672151B1 (en) | 2017-05-10 |
JP5658585B2 (ja) | 2015-01-28 |
EP2672151A4 (en) | 2015-02-18 |
CN103339422B (zh) | 2016-03-09 |
CN103339422A (zh) | 2013-10-02 |
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