Patents by Inventor Guanfei Shi

Guanfei Shi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20250215974
    Abstract: A piston ring with a hard plating and a preparation method therefor are provided. An OD surface of the piston ring includes an interlayer, a gradient metal nitride layer and a DLC repetitive unit layer sequentially from bottom to top; one DLC unit layer in the DLC repetitive unit layer sequentially includes a DLC layer and a metal-doped DLC layer; and chrome plating of a side face of the piston ring is a chrome plating on a side face of a piston ring matrix. The repetitively circulating DLC layers and metal-doped DLC layers are a combination of a micron-thickness layer and a nanometer-thickness layer to form a micro-nano layered structure, so that the binding force between each plating is enhanced and the internal stress of the plating is reduced; and meanwhile, metal doping in the DLC layer can effectively reduce the plating stress and solve the problem of plating peeling.
    Type: Application
    Filed: April 3, 2024
    Publication date: July 3, 2025
    Applicant: Asimco Shuanghuan Piston Ring (yizheng) Co., Ltd.
    Inventors: Kaishun LI, Qianxi LIU, Yueting ZHOU, Guanfei SHI
  • Patent number: 12345336
    Abstract: A piston ring with a hard plating and a preparation method therefor are provided. An OD surface of the piston ring includes an interlayer, a gradient metal nitride layer and a DLC repetitive unit layer sequentially from bottom to top; one DLC unit layer in the DLC repetitive unit layer sequentially includes a DLC layer and a metal-doped DLC layer; and chrome plating of a side face of the piston ring is a chrome plating on a side face of a piston ring matrix. The repetitively circulating DLC layers and metal-doped DLC layers are a combination of a micron-thickness layer and a nanometer-thickness layer to form a micro-nano layered structure, so that the binding force between each plating is enhanced and the internal stress of the plating is reduced; and meanwhile, metal doping in the DLC layer can effectively reduce the plating stress and solve the problem of plating peeling.
    Type: Grant
    Filed: April 3, 2024
    Date of Patent: July 1, 2025
    Assignee: Asimco Shuanghuan Piston Ring (yizheng) Co., Ltd.
    Inventors: Kaishun Li, Qianxi Liu, Yueting Zhou, Guanfei Shi
  • Patent number: 12203553
    Abstract: A wear-resistant and low-friction coated piston ring and a preparation method therefor are provided. The OD surface diamond-like carbon coating consists sequentially of a first metal interlayer, a second metal interlayer, a gradient DLC layer, alternating high/low hardness DLC layers, and an outer running-in DLC layer. The side surface diamond-like carbon coating consists sequentially of a metal interlayer, a gradient DLC layer, and alternating high/low hardness DLC layers. The preparation method employs physical vapor deposition to sequentially deposit composite DLC coatings on the OD surface and side surface of the piston ring. The coating is a tetrahedral amorphous carbon structure, exhibiting good thickness uniformity and fine grain structure. This improves the wear resistance of the piston ring's OD surface and side surface, reduces the aggressiveness of the piston ring side surface against the piston ring groove, and meanwhile avoids adhesion.
    Type: Grant
    Filed: April 1, 2024
    Date of Patent: January 21, 2025
    Assignee: Asimco Shuanghuan Piston Ring (yizheng) Co., Ltd.
    Inventors: Weiwei Shi, Qianxi Liu, Guanfei Shi