PISTON RING AND ENGINE
    1.
    发明申请

    公开(公告)号:US20180231125A1

    公开(公告)日:2018-08-16

    申请号:US15751157

    申请日:2015-08-10

    IPC分类号: F16J9/26 C23C16/26 C23C16/02

    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.

    PISTON RING AND METHOD FOR MANUFACTURING SAME

    公开(公告)号:US20180238450A1

    公开(公告)日:2018-08-23

    申请号:US15751155

    申请日:2015-08-10

    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.