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公开(公告)号:US20180231125A1
公开(公告)日:2018-08-16
申请号:US15751157
申请日:2015-08-10
CPC分类号: F16J9/26 , C23C16/0281 , C23C16/26
摘要: A piston ring in which carbon films with film qualities optimized to be adapted to required performance are formed on an outer circumferential sliding surface and top and bottom surfaces thereof with good productivity is provided, and a high-performance engine which employs the piston ring is also provided. In the piston ring, a carbon film is formed on an outer circumferential sliding surface and top and bottom surfaces. The carbon film contains a stacking of at least two types of carbon film layers with different film qualities, and a thickness ratio of the two types of carbon film layers is different between the outer circumferential sliding surface and the top and bottom surfaces.
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公开(公告)号:US20180238450A1
公开(公告)日:2018-08-23
申请号:US15751155
申请日:2015-08-10
IPC分类号: F16J9/26 , C23C16/27 , C23C16/455 , C23C16/513
摘要: Provided is a piston ring having excellent low-friction properties and abrasion resistance manufactured without the need for precision control using an ordinary film formation device that does not have a special function. A piston ring obtained by coating an amorphous carbon film on the surface of a ring-shaped substrate, the piston ring being configured so that the amorphous carbon film is formed by CVD, an increase region, in which the ratio sp2/sp3 of the sp2 bond to the sp3 bond continuously increases from the substrate surface toward the film surface, and a decrease region, in which the ratio sp2/sp3 continuously decreases, are formed in alternating fashion, a soft film in which the ratio sp2/sp3 is low and a hard film in which the ratio sp2/sp3 is high are formed so as to be layered in alternating fashion by continuous variation of the ratio sp2/sp3 in the boundary between the increase region and the decrease region, and the decrease regions are formed in equal number to or with one region less than the number of increase regions.
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公开(公告)号:US20170167608A1
公开(公告)日:2017-06-15
申请号:US15116883
申请日:2014-02-13
发明人: Takehiko OOSHIRO , Koji MIYAKE , Satoshi YOSHIDA , Eishi FUJIMAGARI , Takeyuki YAMASAKI , Hidetoshi CHIBA
CPC分类号: F16J9/26 , C23C14/0036 , C23C14/025 , C23C14/0605 , C23C16/0272 , C23C16/0281 , C23C16/26 , C23C16/50
摘要: Provided are a piston ring which, even when a sleeve constituted of an aluminum alloy is used, can sufficiently show the required low frictional properties, wear resistance, and low counterpart-material attacking properties, and a process for producing the piston ring. The piston ring has a rigid carbon film formed as the outermost layer thereof and serving as a sliding surface with a sleeve constituted of an aluminum alloy, wherein the rigid carbon film gives an X-ray diffraction pattern that has peaks assigned to graphite crystals. The rigid carbon film of the piston ring is formed using a chemical vapor deposition method. The rigid carbon film of the piston ring has a hydrogen content which is at least 20 atm % but lower than 30 atm %, and gives a Raman spectrum in which the ratio of the area (ID) of D-band peaks to the area (IG) of G-band peaks, ID/IG, is 0.5-2.0.
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